Bank of Indonesia as the central bank have a privilege in monetary and banking. One of the function is to kept the payment system, financial stability, and supervising banking activities. Bank of Indonesia was an independent in accordance with the Indonesian Banking Law and Rules. Right after the announcement of the law number 21 year 2011 about financial services authority, Bank of Indonesia was not the only one institution who undertake all the financial system. Because in accordance to the new rule of law, Bank of Indonesia and financial services authority must have a closing relation to each other that can helped one each other to built a good finance. But not all the functions of Indonesian Bank that moved to financial authority, just the micro prudential that moved, and macro prudential still in Bank of Indonesia. This observation was research about Indonesian Bank functions after the law number 21 year 2011 about financial services authority and the coordination between Bank of Indonesia and financial services authority. The research methods was normative that collected and analyzed the secondary data.